I first got Wileys as issue equipment when I deployed for OIF. I still have the same pair, and use them heavily while driving, shooting, and working with tools.

Let's start with the most important part, the lenses. These are
MIL-PRF-31013 ballistic certified. They are incredibly resistant to scratching – sandstorms, construction, daily wear and carry have not affected them. I even wore out the rubber seals mentioned below, and the lenses were still pristine. They're still so transparent I'm not even aware of the lens, and I'm someone who has never needed correction. However, if you do, they can make prescription inserts of the same material. The lenses snap easily into the frame and are very secure, but can be replaced without undue difficulty. They also came (this model) with a ventilated rubber face seal that was indispensible during sand storms.

The frame is flexible enough to be tough while remaining sturdy, and extremely comfortable. It's very modular. You can swap lenses from clear to smoke to prescription, change from ear pieces to elastic strap with a clip connector. The mounting screws for the hinges are full-length stainless. There is a slide on strap for the regular earpieces, with a nut to tighten behind the head. This causes the frame to bend and conform to the face to seal against dust. Even with that tight, the frame is flexible enough to let you pull the glasses up or down over the ears – we had to do this several times a day when moving in or out between facilities and sand.

Most importantly, their customer service is exceptional. When I eventually broke an earpiece at the hinge (and it only broke partially. It was still wearable for the week), their rep assisted me in identifying which model I had, and sent the spare parts gratis, even after I offered to pay.

Wileys are not cheap, but I can't think of any improvements to make, and they're useful for any task that requires UV protection or safety lenses. Given the engineering and quality, I find the price very reasonable.